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sindresorhus/is-empty-iterableJavaScript

Check if an Iterable is empty

Last commit Sep 14, 2025

 (23 stars) (4 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-epubJavaScript

Check if a Buffer/Uint8Array is EPUB

Last commit May 3, 2021

 (15 stars) (3 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-error-constructorJavaScript

Check if a value is an error constructor

Last commit Apr 7, 2021

 (14 stars) (6 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-executableJavaScript

Check whether a file can be executed

Last commit Feb 1, 2026

 (46 stars) (3 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-filesystem-case-sensitiveJavaScript

Detect whether the filesystem backing a path is case-sensitive

Last commit Apr 2, 2026

 (32 stars) (0 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-finiteJavaScript

ES2015 Number.isFinite() ponyfill

Last commit Apr 7, 2021

 (20 stars) (6 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-fnJavaScript

Check if a value is a function

Last commit May 3, 2021

 (29 stars) (7 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-fullwidth-code-pointJavaScript

Check if the character represented by a given Unicode code point is fullwidth

Last commit Aug 31, 2025

 (51 stars) (15 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-generator-fnJavaScript

Check if something is a generator function

Last commit Jul 8, 2022

 (24 stars) (8 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-gifJavaScript

Check if a Buffer/Uint8Array is a GIF image

Last commit Jul 8, 2022

 (30 stars) (3 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-github-downJavaScript

Check if GitHub is down

Last commit Oct 17, 2021

 (133 stars) (8 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-herokuJavaScript

Check if your code is running on Heroku

Last commit Jun 21, 2023

 (19 stars) (9 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-htmlJavaScript

Check if a string is HTML

Last commit Sep 9, 2025

 (95 stars) (11 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-hyperJavaScript

Check if you're running in Hyper

Last commit Apr 30, 2024

 (24 stars) (2 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-identifierJavaScript

Check if a string is a valid JavaScript identifier

Last commit Jul 12, 2024

 (29 stars) (2 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-imageJavaScript

Check if a file path is an image

Last commit Jul 25, 2023

 (99 stars) (11 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-in-ciJavaScript

Check if the process is running in a Continuous Integration (CI) environment

Last commit Aug 17, 2025

 (39 stars) (3 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-in-sshJavaScript

Check if the process is running in an SSH session

Last commit Feb 13, 2026

 (23 stars) (2 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-inside-containerJavaScript

Check if the process is running inside a container (Docker/Podman)

Last commit Oct 27, 2023

 (76 stars) (2 forks) (0 indexed issues) (0 open good first issues)
sindresorhus/is-installed-globallyJavaScript

Check if your package was installed globally

Last commit Nov 6, 2023

 (71 stars) (5 forks) (0 indexed issues) (0 open good first issues)